Question

Which of the following is used for the preparation of colloids?

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Answer 1

Bredig’s Arc Method is used for preparation of colloidal sol's of less reactive metal like $Au,Ag,Pt$
Electrical disintegration method is also known as Bredig's arc method.
This process involves both dispersion & condensation.
Here, the electric arc is struck between metal electrodes immersed in ​the dispersion medium​.
The intense heat produced vapourises the metal (dispersion), which then condenses to form particles of colloidal size.